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 Based on reliability theory,the specification of accelerate life test for friction welded joints in boiler snake pipe was worked out.The correctness of the specification and the concordance of the failure mechanism on the different combined stress levels were verified by high temperature internal pressure burst duration test for a large number new friction welded joints of 15CrMo steel.The mathematical model,which was used to calculate residual life with reliability for the friction welded... Based on reliability theory,the specification of accelerate life test for friction welded joints in boiler snake pipe was worked out.The correctness of the specification and the concordance of the failure mechanism on the different combined stress levels were verified by high temperature internal pressure burst duration test for a large number new friction welded joints of 15CrMo steel.The mathematical model,which was used to calculate residual life with reliability for the friction welded joints of 12Cr1MoV steel having worked 132 000 hours,was set up.Through calculation of the test data,the following conclusions were drawn: the friction welded joints is very reliable in the design life;the quality of the friction welding procedure is stable.The test method and mathematical model related in thepaper also have practical value to forecast the residual life for high temperature pressure containing and to determine the refresh time for extended service pipe and welded joint.  以可靠性理论为基础 ,制定了电站锅炉蛇形管焊接接头的加速寿命试验规范。通过对大量新制的 15CrMo摩擦焊接头的高温内压爆破持久试验 ,证明了试验规范的正确性和各组合应力水平的失效机理的一致性。在此规范的基础上 ,对已运行过132kh的 12Cr1MoV摩擦焊接头 ,建立了带有可靠度指标的残余寿命数学模型 ,计算结果表明摩擦焊接头 ,在设计寿命期内是完全可靠的 ,摩擦焊这种焊接工艺的质量是稳定可靠的。文中提出的试验方法和数学模型对高温承压部件的残余寿命的预测和确定那些超期服役管道或接头的更换时间方面具有实际意义  Based on reliability theory in this paper,the method and specification of accelerated life test for friction welded joints in boiler snake pipe were worked out.The correctness of the specification and the concordance of the failure mechanism of the friction welded joints on the different combined stress levels were verified by high temperature internal pressure burst duration test with accelerated life senses for a large number new fiction welded joints of 15CrMo steel and by analyzing the... Based on reliability theory in this paper,the method and specification of accelerated life test for friction welded joints in boiler snake pipe were worked out.The correctness of the specification and the concordance of the failure mechanism of the friction welded joints on the different combined stress levels were verified by high temperature internal pressure burst duration test with accelerated life senses for a large number new fiction welded joints of 15CrMo steel and by analyzing the test results.The mathematical model, which was used to calculate residual life with reliability for the friction welded joints of 12Cr1MoV steel having worked 132000 hours,was set up.With the help of the model, the residual life of the new and old friction welded joints was calculated.Through calculation of the test data,the following conclusions were drawn: the friction welded joints is very reliable during the design life;the quality of the friction welding procedure is stable;the test method and mathematical model are of the practical value to forecast the residual life for high temperature pressure containing and to determine the refresh time for extended service pipe life and welded joints.  该文以可靠性理论为基础 ,研究制定了电厂锅炉蛇形管焊接接头的加速寿命试验的方法和规范。通过对大量新制的 15CrMo摩擦焊接头具有加速寿命意义的高温内压爆破持久试验 ,和对其试验结果的分析、处理 ,证明了试验规范的正确性和各组合应力水平的失效机理的一致性。在此规范的基础上 ,对已运行过 13.2× 10 4h的 12Cr1MoV摩擦焊接头 ,建立了带有可靠度指标的残余寿命数学模型。借助此模型 ,对新旧两种摩擦焊接头进行了寿命预测计算。结果表明摩擦焊接头 ,在设计寿命期内是完全可靠的 ,摩擦焊这种焊接工艺的质量是稳定可靠的 ,文中所述的试验方法和寿命预测模型对高温承压部件的残余寿命的预测 ,和确定那些超期服役管道和接头的更换时间方面具有指导意义。  The reasonable techniques, are used to produce nodular iron steamer casting which can meet the mechanical property of ferrite matrix are confirmed by analyzing the influence factors of high temperature pressure containing nodular iron ascast property such as chemical composition, desulphurization, spheroidization, inoculation treatment.  通过对影响高温承压球墨铸铁铸态性能的化学成分、脱硫、球化、孕育处理等因素进行分析 ,确定合理的控制工艺 ,在铸态下生产出力学性能满足铁素体基体的球墨铸铁燃汽轮机铸件  
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